Looper mechanism for sewing-machines.



A. H. DE VOE L00 PER MECHANiSM FOR SEWING MACHINES. APPLICATION FILED DEC. 12. 1914.

1,243,145. Patented Oct; 16,1917.

0 WI T/VESSES:

A. H. DE VOE. LOOPER MECHANISM FOR SEWING MACHINES.

APPLICATION mm 05c. 12. m4.

24,159 Patented Oct. 16,1917.

2 SHEETS-SHEET 2.

WIT/VESSES: IIIIVENTOR I v Ana/my ALBERT :on voE, 0E wEsTEIELn NEW JERSEY, ASSIGNOR TO THE-SINGER MANU- rec'rnnme COMPANY; A CORPORATION OF NEW JERSEY.

LOOIER MECHANISM FOR SEWING-MACHINES.

Application filed December 12, 1914. Serial No. 876,763.-

To all whom it may concern.

Be it known that I, ALBERT H. DE Von, a citizen of the United States, residing at lVestfield, in the county of Union and State of New Jersey, have invented certain new vide looper mechanism for sewing machines and more particularly machines adapted for glove sewlng and s1m1lar uses.

The improvements may be used in conjunction with needle actuating and feeding mechanisms of any suitable form, the 1m provements being especially adapted, however, to the general machine construction shown and described in my application filed October -18, 1913, Serial No. 795,841, in which the reciprocatory needle-bar is provided with a transverse pin slidingly fitted within the boss of a strap embracing an actuating eccentric upon the rotary driving shaft, the feeding mechanism comprising a horizontally arranged feed-wheel carrying a plurality of ratchet-wheels of progressively smaller diameters operatively e11- gaged by one of a series of selective pawls carried by a pawl block.

The looper mechanism of the present improvements comprises a vibratory and endwise movable looper-bar carrying a looper at one end and pivotally connected at the opposite end with a rocking element fulcrumed upon a swinging arm and carrying studs upon opposite sides of its fulcrum point engaging actuating Came from which the rocking element derives both rocking and bodily reciprocating movements upon arm connected by a pitman with a swinging lever actuated by a cam upon saiddriving shaft.

The mechanism thus briefly described imparts to the looper the requisite six-motioned travel required in the class of 'overseaming mechanism to whlch the present 1mprove ment more particularly relates, the move-- ments being efiected through actuating cams which are without harsh or abrupt shoul- 1 In the accompanying drawings, Figure l is a side elevation, partly in section, of a machine embodying the present improve.

ments, andFig. 2 is a top plan of the same. Figs. 3 and 4 are detailperspective views of certain connected parts of the improvements.

The improvements are shown mounted within a frame comprising the hollow base 1 from which rises the standard 2 provided with the transverse mainor' driving shaft and the crossshaft 4E disposed above and parallel with the same. Adjustably' secured upon the main shaft 3 is the gear-wheel 5 provided in one face with the cam-groove 6 and in the opposite face with the camgroove 7 and meshing with the gear-wheel 8 similarly secured by means of the setscrew 8 upon the shaft 4 and having the cam-groove 9 in the face corresponding with that of the gear 5 containing the camgroove 6.

Mounted within the standard 2 upon the cross pin 10v is the hub 11 of a swinging arm 12. having journaled in the boss 13 at its upper end a fulcrum pin 14iextending laterally from a cruciform rocking or cam follower element having upwardly extending and depending arms 15 and 16 carryingrespectively the roller studs 17 and 18 which enter the cam-grooves 9 and 6 respectively. The said rocking element is provided with lateral arms19 and 20 carrying screw-studs 21 entering slots 22 in a plate 23 which is provided at its forward end with the laterally'offset extension 24provided With thebearing boss 25.

Journaled in the bearing boss 25 is the pivotal pin 26 formed with the forked end 27 in which ispivotally secured by means of the pin 28 theapertured extremity of the split socket 29 in which is secured by means of the clamp-screws 30 the rearward end of the looper bar 31 having fitted upon its forward; end'the looper socket 32 secured thereon by means of the set-screw 33 and having fastened therein-by means of the'set screw 34 the shank 3530f the looper which is represented as formed with the eye-pointed blade 36.

The looper-bar is slidinglyjournaled intermediate itsends in the tilting bearing sleeve 37 which is pivotally sustained by means of the sc'rew pin 38 between the spaced cars 39 of a block formed in the head of a rocking Patented Oct. re, 1917.

pin 4:0. The 40 is journaled within the bearing bossl on one arm 42 of a rocker formed with a second angularly disposed arm 43 and fulcrumed by means of the studscrew 4 upon a lateral. ear 45 extending from the collar 46 secured by means of the cross pin 4:7 and setscrew 48 upon the re duced end 49 of'a block 50 which is fitted within the apertured boss 51 of the stand.-

ard 2.

,Journaled upon the shaft dis the apertured boss 52 of a swinging lever 53 carrying a roller-stud 54: entering the cam-groove 7 of the gear-wheel and havinga laterally 20. the looper actuating cam-grooves 6 and 9 offset extension 55 carying the ball-stud 56. The ball-stud 56 is embraced by a strap 57 at one end of a short pitman 58 having. at its opposite-end a strap 59 which embraces a ball-stud 60 carried by the rocker-arm 43. As will be observed by reference to Fig. 1,

are of different shape and are soformed that the entering: studs. 17 and 18 of the rocking element are caused to perform differentially timed reciprocatory movements whereby the rocking element is given not only rocking movements upon its supporting fulcrum stud 14, but receives bodily movements lengthwise ofthe looper-bar which, through the pivotal connection 28 therewith, communicate to the adjacent end of the looper-bar endwise reciprocatory and vibratory movementsin a vertical direction. By

its described connections with the cam ele-, ,cmentr 5, the rocker 42 4:3 communicates to its several movements, and the construction and arrangement of the parts and connec ,tions enable the machine to'beoperated at high speeds without excessive friction and wear. 1 I

Having thus set forththe nature of the invention, what I claim herein is 1. In a sewing machine, the combination with c a vibratory and, endwise -movablc looper-bar, a looper mounted thereon, and a fulcrum for said bar, of a rockingoand bodily movable element pivotally connected with'said bar on an axis extending trans-a versely of said bar, and difierentially timed; actuating elements acting through saidirock f ing and bodily movable. element to-impart vibratory and endwise movements to, the looper-bar.

2. In a sewmg machine, the combinationwith a vibratory and endwise movable looper-bar, a looper mounted thereon, and a fulcrum for said bar, of a rocking ele-.

ment -.pivota11y..connected withsaid. bar on.

an axis extending transversely of said bar and spaced from the axis of vlbratory move;

ment of said bar, a fulcrum for said element movable crosswise of said axis, and diiferent allyracting actuating elements for communicating to said rockin element its rocking and bodily crosswise movements upon its fulcrum. V

3. a sew ng; machine, the combinatlon with a vibratory and endwise movable looper-bar, a looper mounted thereon, and

a fulcrumfor said bar, of, arocking element pivotally connected with said bar on an axis extending transversely of said bar and spaced from the axis of vibratory move ment of said bar, afulcrum for said element, a swinging arm for, sustaining the, fulcrum for said element, and means actingion said element'independently ofsaid swinging arm for communicating to said element its rocking and bodily crosswise movements upon its fulcrum.

et. In a sewing machine, the combination with a vibratory and endwise movable looper-bar, a looper mounted thereon, and a fulcrum for said bar, of a support for said fulcrum movable crosswise of said bar, a rocking and bodily movable element pivotally connected with said bar, and means for imparting operative movements to said fulmg arm carrying a fulcrum upon which said rocking, element is mounted,- ,actuating 7 means for reciprocat ng parts of said rocking element upon opposite sides of'its fulcrum at different speeds and a pivotal connection between said; looper-bar and said rockingelement at a point of the latter removed from its fulcrumand from said oppos'itely disposedparts V 6.7, In a sewing machine-the combination with a vibratory and; endwise movable looper-bar carrying a looper, and a -fulcrum for said bar, of a rocking-element, a movable fulcrum sustaining the same, actuating means including connections with said rock;

ing element for imparting to the latter .rocking and bodily reciprocatingmovements in a plane substantially'parallel with said bana pivotal connection between said rocking element and said bar, and an operative connection independent of saidconnections with the rocking element between said actuating means andv the looper-bar fulcrum for imparting to, the latter movements crosswise. ofsaid looper-bar.

7. In a sewing machine, 7 the combination with a vibratory and endwise, movable looper-bar carrying a looper, means includ 1 ing a plurality of cam-elements and asingle-cam-follower element acted upon hy said cam elements for imparting said movements to the looper-bar, a looper-bar ful crum, a support therefor movable crosswise of the looper-bar, a swinging lever operatively connected with one of said camelements, and a connection between said swinging lever and the fulcrum support for the looper-bar for imparting sidewise movements to the latter.

8. In a sewing machine, the combination with a reciprocating needle, a vibratory and endwise movable looper-bar carrying a looper having a beak directed transversely of the needle and adapted to seize a loop of needle-thread, means including a plurality of cam-elements for imparting said movements to the looper-bar, a looper-bar fulcrum, a rock-lever sustaining said fulcrum and having a pivotal support extending in a direction transversely of the looper beak and needle, a swinging lever operatively connected with one of said camelements and a pitman connection between said swinging lever and a point of said rock-lever disposed at one side of its pivotal support.

9. In a sewing machine, the combination with a vibratory and endwise movable lcoper-bar carrying a looper, of a sleeve embracing said looper-bar and affording a fulcrum therefor, supporting means for said sleeve adapted to permit movement of the latter in a direction crosswise of the looperbar, a rocking element pivotally connected with the looper-bar rearwardly of said sleeve, a movable fulcrum for said rocking element, and means for imparting movements to said rocking element both bodily with its fulcrum and relatively to the latter.

10. In a sewing machine, the combination with a vibratory and endwise movable looper-bar carrying a looper, of a tilting bearing within which the looperbar is slidingly mounted, means for moving said bearing in a direction crosswise of the l0operbar, a rocking element pivotally connected to the looperbar, a swinging arm upon -which the rocking element is fulcrumed,

studs carried by said rocking element upon opposite sides of its fulcrum point, and actuating cams engaging said studs and adapted to impart to the rocking element bodily reciprocating movements, and rocking movements upon its fulcrum.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

ALBERT II. DE VOE.

W'itnesses W. LEE HELMs, H. A. KORNEMANN, J r.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

